Soot blower



May 26, 1931. G. 1. RAwsoN 1,807,255

5001 BLOWER Filed April 24 1922 3 Sheets-Sheet 1 mhmta'r 7 Grantf.Haurson Gun/mean May'26, 1931. e. RAWSON SOOT BLOWER Fined pril-2 1922 sSheets-Sheet 2 May 26, 1931-. a. l. RAWSON 1,807,255

I 500': BLOWER I Filed April 24, 1922 3 Sheets-Sheet 3 Grant I. fiau/sonwgmm-w Qua mu v Patented May 26, 1931 UNITED STATES ATENT OFFICE GRANTI. RAWSON, OF DETROIT, MICHIGAN, ASSIGNOR TO DIAMOND POWER SPECIALTYCORPORATION, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN SOOT BLOWERApplication filed April 24,

This invention relates to boiler cleaners and more particularly toboiler cleaners employing a nozzle adapted both for reciprocatory androtatable movement.

It is an object of the invention to provide a'boiler cleaner of thespecified type in which positive provision is made for determiningconsecutive positions of reciprocation of the nozzle and for compellinga definite rotation of the nozzle in such positions. A further object isto positively prevent rotatable actuation of the nozzle in any positionof reciprocation intermediate said predetermined rotatable positions.

The invention consists further in a novel provision for maintaining thefluid supply to the nozzle in its various positions of use.

In the drawingsz- Figure 1 is a longitudinal vertical sectional viewshowing the improved blower in its application to a tubular boiler ofthe Scotch marine type; i

Figure2 is a view showing the blower unit, in side elevation and partialsection, in its position of use in a'boiler tube;

Figure 3 is a view in elevation of the actuating member for the blower;

Figures 4, 5 and6 are cross sections taken respectively on lines M, 55and 66 of Figure 2;

Figure 7 is a perspective view of a collar which forms a control elementof the blower;

F igure' 8 is a view showing the relation of the blower nozzle to theflue sheet in which the fire tubes open.

In these views, 1 designates the fire tubes of a Scotch marine boilercommunicating at their ends respectively with the combustion chamber 2and smoke box 3, the latter provided with the usual door 4 hinged as at4. The hereindescribed blower is disposed within a fire tube 1 whichoccupies, preferably, a substantially central position with respect tothe remaining tubes. Said blower comprises a pipe 5 adapted to fitfreely within the front portion of the tube 1. In the ends of the pipe 5there are fixedly inserted forward and rearplugs 6 and 7, and a rod 8passing slidably through the plug 6 and a tube 9 slidably engaging theplug 7 are rigidly 1922. Serial No. 556,308.

suitable coupling 10 with a tubular extension 11 which terminallycarries a nozzle 12 in the form shown being a double nozzle, the outletsof which as shown, open back to discharge against the forward flue sheetat opposite inclinations to the axis of the blower although variouscombinations of outlets could be employed. Adjacent said nozzle, theextension 11 slidably engages a guide collar 13 which is secured to theplug 7 by a pair of bars 14 arranged to securely connect 7 and 13. Steamis delivered 'to the pipe 5 by a pipe 15 opening into a passage 16 inthe lower portion of the plug 6 and rigidly secured to said plug by atongue 16*. From the pipe 5 the steam is free to enter the tube 9 by wayof a port 17 in the forward portion of the latter, said tube and itsextension 11 delivering the steam to the nozzle 12. To prevent a leakageof steam from the pipe 5 around the rod 8 and tube 9, as they passthrough the plugs 6 and 7, packing rings 18 are arranged within saidplugs to snugly embrace said rod andtube, and aremaintained undersuitable compression by glands 19.

Owing to the presence of the steam passage 16 in the lower portion ofthe plug 6 it is necessary to pass the rod 8 through the upper portionof said plug. Said rod 8 and the tube 9 and its extension 11 areconsequently slightly inclined downwardly as they extend rearwardly sothat said tube may centrally engage the plug 7. i i r The rod 8 passesthrough the smoke box 3 and through an aperture 20 formed in the door 4.Said rod further is adapted to projeot through a central opening 21 in aplate 22 exteriorly secured to the door at by bolts 23 or other suitablemeans. The forward end portion of said rod is threaded for detachableengagement by the aligned elongated stem 24 of an actuating memberprovided upon its forward end with oppositely projecting handles 25which serve both to apply rotation and reciprocation to the actuatingmember. The threaded forward portion of the rod 8 is furthermore engagedby a collar 26 which is fixed upon said rod, as by a set screw 27 andwhich when the unit is out of use, is disposed, ,(as shown in Figure 2),within a housing 28 integral with the plate 22. Said collar coacts witha plunger pawl 29 when the blower unit is out of use to prevent anyaccidental or improper forward hifting of the reciprocatory parts. Saidpawl is mounted within a downward cylindrical extension 30 of thehousing 28 and is upwardly urged by a coiled spring 31, so as tonormally project said pawl into the path of the collar 26. lVhen theblower is retracted and the actuating member is being screwed upon therod 8 to adapt the blower for use, a tug 33 projectin r erwardly fromthe collar 26, is engageable, through a slight angular movement of theblower, with the pawl 29 to hold the rod 8 against further turning, Suchenga ement of the lug 33 and pawl .29 registers a beveled portion 34 atthe ear ext emit of the collar 26 with said pawl, so that, forwardpressure exerted throughthe actuating member upon the reciprocatingparts, will cause the beveled face 3 f to depress the pawl, thuspermitting the initial projecting movement of said reciproeating parts.I I i At predetermined spaced intervals, the stein 24 is formed with aseries of annular grooves 35335 35, etc. whi ch are connected bylongitudinal channels 36 similarly oifset circumferentially from end toend of the series. he rear wall of each groove 35 is beveled, asindicated at 35, and the forward face of the collar 26 is similarlybeveled, as indicated at 37. V j v Considering now the operation of thedescribed blower unit, it is to be understood first that in the normalor stored position of fthe unit the nozzle 12isdisposed within the Ilire tubel slightly baclcifrom the rear end thereof, being thusprotected from the high temperature prevailing Within the combustion'chamber. To put the blower into use,

the actuating member is first applied by screwing the stem 2e thereofupon the forward end of the rod 8. The latter in the stored position ofthe blower projects some distance forwardly from the plate 22 (seeFigure 2). hen the a:. :tuatin'g member has been thus applied, steam isturned into the delivery pipe 15 being delivered therefrom to the pipe 5thence-to the tube 9 by way of port'17, and through said tube and:

its extension to the nozzle. The unbalanced pressure of thesteam uponthe nozzle is suiiicient tosubstantially counteract the frictionalresistance arising from the packed bearings engaging the rod Sand tube 9within the plugs 6 and 7, so that very-slight eflortis suflicient toproject the nozzle. In screwing the stem 24 upon the rod 8, the

latter will be turned sufiiciently to engage the lug 33 with the pawl 29and since under these conditions the beveled face 34 registers with saidpawl, the initial projecting movement may be effected as soon as theactuating member has been attached. The first position of use of thenozzleis established when the projecting movement hasregistered the pawl29 with the first annular groove 35.

advanced another step until the pawl 29 en te'rs the second groove 35The blower is now actuated again through substantially a completerevolution until the next channel 36 i registered with the pawl 29. Thusthere is effected a succession of. alternating rotary and reciprocatingmovements of the nozzle, predetermined by the location of the grooves 3535", etc. and channels 36 in the stem 24, and the resulting rotatablepositions of the nozzle are such asto register the discharging jets ofcleaningfluid with successively enlarged circles of fire tube openingsin the flue sheet 38. The rotatary actuation in each position of thenozzle should of course, be sufficiently gradual to effect an adequatedelivery of the cleansing fluid (ordinarily steam) to all of the tubesto be cleaned. Having thus completed the cleaningv operation, theoperator returns the blower to its stored position by a direct forwardmovement, no opposition to said movement being offered by the pawl 29since thesame rides uponthe beveled faces 35. and 37. j

7 It is to be observed that in all positionof reciprocation of thedescribedblower, asupply of the cleansingfluid to the nozzle ismaintained through the port '17 the length of the pipe 5 being adequateto maintain communication with said tube by said port in all of aactuating member 24-, 25 is applied. to the blower only during use ofthelatter.

It is a feature of the invention that the operation of. attaching theactuating member accomplishes a release of the reciprocating parts fromthe locking means (collar 26 and pawl 29) whereby said parts arenormally rean actuating member therefor freely mov-' able between itslimits of reciprocation in one direction, and means coacting with saidactuating member to permit rotation at predetermined points only ofreciprocatory travel in the other direction.

2. In a boiler cleaner, the combination with a reciprocatory androtatable nozzle, of an actuating member therefor comprising a stemformed with a plurality of spaced circumferential grooves and havingcircumferentially offset longitudinal channels connecting said grooves,and a pawl engaging in said grooves and channels during projection ofthe nozzle to permit a predetermined rota.

tion of the nozzle at predetermined points in the projecting movementthereof.

8. In a boiler cleaner, the combination with a reciprocatory androtatable nozzle, of an actuating member therefor, comprising a stemformed with a plurality of spaced circumferential grooves, each having acorrespondingly beveled edge and having circumferentially offsetchannels connecting said grooves, and a pawl yieldably engageable insaid grooves and channels to permit a predetermined rotation of theactuating member at predetermined points in its projecting movement,said pawl riding upon said beveled edges during the retractive actuationof the nozzle.

4. In a boiler cleaner, the combination with a reciprocatory androtatable nozzle, of a member rigidly connected with the nozzle formovement therewith, said member having a lug projecting toward thenozzle and having an adjacent beveled face, a pawl yieldably urgedtoward the axis of said member, coacting with said member to normallymaintain the re racted position of the nozzle, and coacting in saidposition with said lug to limit rotation of the nozzle, the beveled faceof said member being adapted to ride on said pawl to retract the sameand permit projection of the nozzle when said lug engages the pawl.

5. In a boiler cleaner, the combination with a reciprocatory androtatable nozzle normally stored and having a series of projectedpositions of use, an actuating member for said nozzle, and meanscompelling rotative actuation in alternation with projecting movementsof the nozzle to predetermine said successive positions of use of thenozzle.

6. In a boiler cleaner, the combination with a reciprocatory androtatablenozzle, of

an actuating member therefor comprising a stem formed with a pluralityof spaced circumferential grooves and having circumferentially oflsetchannels connecting said grooves, and a pawl yieldably engageable insaid grooves and channels to permit a predetermined rotation of theactuating member at predetermined points in its projecting movement, oneof the faces of said pawl and of each groove engaging the same duringretraction of the nozzle being bevelled to permit said faces to ridefreely one on the other during such retraction.

7. In a boiler cleaner, the combination with a reciprocatory androtatable nozzle within a boiler, of an actuating member for said nozzleprojecting exteriorly of the boiler in the retracted position of saidnozzle, and means coacting with said member to definitely determinerotative positions of the nozzle spaced in the direction of itsreciprocation.

8. In a boiler cleaner, the combination with a reciprocatory androtatable nozzle, an actuating member therefor, adapted to reciprocateand to rotate said nozzle, and means co-acting with said actuatingmember to permit rotation of said nozzle at predetermined points only ofthe reciprocatory travel of said nozzle.

9. In a boiler cleaner, the combination with a nozzle adapted inactuation to be both rotated and moved longitudinally, of meansperiodically limiting longitudinal movement of said nozzle to compel arotation thereof during its cycle of longitudinal movement.

10. In a boiler cleaner, a blower mounted for rotative movement and forlongitudinal movement to spaced blowing positions, means for impartingboth of said movements to said blower, and means guiding the movement ofsaid blower and providing for rotation of said blower withoutlongitudinal movement thereof in one blowing position and for alongitudinal movement of said blower from this blowing position to asecond blowing position, said last mentioned means including a membermovable with said blower and having spacedcircumferential grooves and alongitudinally extending groove connecting said circumferential grooves,and a second member fixed against movement with said blower andengageable in the said grooves.

11. In a boiler cleaner, a blower mount-ed for rotative and longitudinalmovement, means for moving said blower, and means guiding the movementof said blower and providing for rotation of said blower withoutlongitudinal movement thereof at spaced points and for a longitudinalmovement of said blower from one of said points of rotative movement toa second point of rotative movement, said last mentioned meansincluding'a member movable with the blower and having spacedcircumferential grooves and a longitudinally extending groove connectingsaid circumferential grooves, a pm fixed against movement with saidblower, and means yieldably urging said pin in engagement with saidgrooves.

In testimony whereof I afiix my signature.

GRANT I. RAvVSON.

